Keep the water at a normal temperature for mollies: 78-82° F. She'll do just fine.
Goldfish can not be pregnant. They lay eggs (spawn) in Springtime when the water temperature starts to warm up towards 70F.
room temperature
In general, pregnant women should not use water pills unless a physician recommends their use
The temperature should NOT EXCEED 104oF.
The water should be at room temperature.
It should be a cold temperature.
The water temperature for a French press should be around 200F (93C) for best results.
The water temperature for using a French press should be around 200F (93C).
Goldfish are cold water fish and should not be kept in an aquarium with a tropical molly. There is no way they can cross breed. Fish are not stupid and do know the difference between one of their own species and a species that should not be in there with them. It is quite possible the goldfish will eventually kill the molly. Failing that, if your tank is not heated, the Molly will probably die during the winter if the temperature gets below 65F for too long anyway.
The water temperature for making French press coffee should be around 200F (93C).
Items should be immersed in water at a temperature of at least 171F (77C) for 30 seconds for hot water sanitizing.
Obviously one male and one female is needed, but also the temperature of your water must be warm enough as we are talking about tropical fish. Different types of molly can breed, so can different species from their family. Guppy/molly hybrids (gullies) are an example.